// 查找一个数组前面的三连数字
const digitsRE = /(\d{3})(?=\d)/g;

export function currency(value, currency, decimals) {
    value = parseFloat(value);
    if (!isFinite(value) || (!value && value !== 0)) return "";
    currency = currency != null ? currency : "$";
    decimals = decimals != null ? decimals : 2;
    var stringified = Math.abs(value).toFixed(decimals);
    var _int = decimals ? stringified.slice(0, -1 - decimals) : stringified;
    var i = _int.length % 3;
    var head = i > 0 ? _int.slice(0, i) + (_int.length > 3 ? "," : "") : "";
    var _float = decimals ? stringified.slice(-1 - decimals) : "";
    var sign = value < 0 ? "-" : "";
    return (
        sign + currency + head + _int.slice(i).replace(digitsRE, "$1,") + _float
    );
}
